CVE-2013-6420
The asn1_time_to_time_t function in ext/openssl/openssl.c in PHP before 5.3.28, 5.4.x before 5.4.23, and 5.5.x before 5.5.7 does not properly parse (1) notBefore and (2) notAfter timestamps in X.509 certificates, which allows remote attackers to execute…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 35.6%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
Description
The asn1_time_to_time_t function in ext/openssl/openssl.c in PHP before 5.3.28, 5.4.x before 5.4.23, and 5.5.x before 5.5.7 does not properly parse (1) notBefore and (2) notAfter timestamps in X.509 certificates, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted certificate that is not properly handled by the openssl_x509_parse function.
- CVSS 2.0
- 7.5 HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P
- EPSS
- 35.63% probability · 98th percentile
- Public exploits
- 1 in Exploit-DB · first 17 December 2013
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- php/php · opensuse/opensuse · apple/mac os x
- Source
- secalert@redhat.com
EPSS 35.6% since 4 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://forums.interworx.com/threads/8000-InterWorx-Version-5-0-14-Released-on-Beta-Channel%21
- http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=c1224573c773b6845e83505f717fbf820fc18415
- http://lists.opensuse.org/opensuse-updates/2013-12/msg00125.html
- http://lists.opensuse.org/opensuse-updates/2013-12/msg00126.html
- http://rhn.redhat.com/errata/RHSA-2013-1813.html
- http://rhn.redhat.com/errata/RHSA-2013-1815.html
- http://rhn.redhat.com/errata/RHSA-2013-1824.html
- http://rhn.redhat.com/errata/RHSA-2013-1825.html
- http://rhn.redhat.com/errata/RHSA-2013-1826.html
- http://secunia.com/advisories/59652
- http://support.apple.com/kb/HT6150
- http://www.debian.org/security/2013/dsa-2816
- http://www.php.net/ChangeLog-5.php
- http://www.securityfocus.com/bid/64225
- http://www.securitytracker.com/id/1029472
- http://www.ubuntu.com/usn/USN-2055-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1036830Patch
- https://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04463322
- https://www.sektioneins.de/advisories/advisory-012013-php-openssl_x509_parse-memory-corruption-vulnerability.htmlExploit
- http://forums.interworx.com/threads/8000-InterWorx-Version-5-0-14-Released-on-Beta-Channel%21
- http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=c1224573c773b6845e83505f717fbf820fc18415
- http://lists.opensuse.org/opensuse-updates/2013-12/msg00125.html
- http://lists.opensuse.org/opensuse-updates/2013-12/msg00126.html
- http://rhn.redhat.com/errata/RHSA-2013-1813.html
- http://rhn.redhat.com/errata/RHSA-2013-1815.html
- http://rhn.redhat.com/errata/RHSA-2013-1824.html
- http://rhn.redhat.com/errata/RHSA-2013-1825.html
- http://rhn.redhat.com/errata/RHSA-2013-1826.html
- http://secunia.com/advisories/59652
- http://support.apple.com/kb/HT6150
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.